UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

PCI: mvebu: Fix reporting Data Link Layer Link Active on emulated bridge 

Add support for reporting PCI_EXP_LNKSTA_DLLLA bit in Link Control register
on emulated bridge via PCIE_STAT_OFF reg. Function mvebu_pcie_link_up()
already parses this register and returns if Data Link is Active or not.

Also correctly indicate DLLLA capability via PCI_EXP_LNKCAP_DLLLARC bit in
Link Control Capability register which is required for reporting DLLLA bit.

Link: https://lore.kernel.org/r/20220104153529.31647-12-pali@kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Pali Rohár 2022-01-04 16:35:29 +01:00 committed by Lorenzo Pieralisi
parent c94ea32c0d
commit c3bd7dc553
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/pci/controller/pci-mvebu.c
View File

@ -548,13 +548,18 @@ mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge,
/*
* PCIe requires that the Clock Power Management capability bit
* is hard-wired to zero for downstream ports but HW returns 1.
* Additionally enable Data Link Layer Link Active Reporting
* Capable bit as DL_Active indication is provided too.
*/
*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
~PCI_EXP_LNKCAP_CLKPM;
*value = (mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) &
~PCI_EXP_LNKCAP_CLKPM) | PCI_EXP_LNKCAP_DLLLARC;
break;
case PCI_EXP_LNKCTL:
*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL);
/* DL_Active indication is provided via PCIE_STAT_OFF */
*value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL) |
(mvebu_pcie_link_up(port) ?
(PCI_EXP_LNKSTA_DLLLA << 16) : 0);
break;
case PCI_EXP_SLTCTL: